What catches my attention the most in the last video is when Madmole says “Sean’s working on the AI and the pathing right now." I'd be very interested in more detail on what the goal of this work is.
Certain areas of the game, like underground and stilt bases, can't be made engaging, challenging, or balanced with the tools available in Alpha 16. It seems apparent that systems will need to be added or overhauled to fill this fundamental design shortfall. But, in Beta, you don't add or overhaul major systems, basically by definition.
So as the "Alpha 17 = Beta" narrative continues, I have to hope as-yet-unannounced work on AI is geared towards addressing this. There are a lot of things that could go post-release, but I don't think gameplay fundamentals - like engagement, challenge, and balance throughout the game's domain - should be among them.